Antifriction-bearing.



R. J. KOSTER.

ANTIFRICTION BEARING. APPLlcAnoN man JUNE 4.15m.

1,220,345. Patented Mar. 27,1917.

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REGINALD JAGGB KOSTER, OF PHLDELPHIA, PENNSYLVANIA.

.anrrrarorroN-ena'arns.

Speccaton of Letters Eatent.

Patented Mar. 2*?, isili?,

Application led June 4, 1915. Serial No. 32,032.

v To all whom it may concern Be it known that l, REGINALD JACOB Kos-TER, a citizen of the United States, residing at Philadelphiminthecounty of Phila.- delphia and State ci Pennsylvania, have 1n- `ventedcertain new and useful Improvethe following is. a specification,reference .being hadv therein to 'the accompanying mentsinAntiiriction-Bearings, of which drawing. This invention relates .toantifriction bearings of -the type comprising. inner and outer casingmembers and a series of interminimum of friction and an absencepf slid`-ing or slippage. With these objects 1n view,

cumferentially extending bearing surfaces,

sloping from the center of the element outwardly in opposite directions,and adapted to travel respectively on the opposing tracking surfaces ofthe casing members, the said latter surfaces and those on the rollingelements being of such relative` i'omn, that they willcngage each otherand travel on single lines of contact. .As a. result of thisconstruction and arrangement, the rolling elements will present at their.opposite ends, outwardly sloping abutments opposed at an anglerespectively to the tracking surfaces on the casing members, whichabutments will receive conjointly the radial loads imposed on thebearing, and will receive also individually and alternately, the `thrustloads exerted respectively in'opposite directions, the travel of therolling elements on the trackinv surfaces on single lines of contact,insuzing a true rolling action in the roperationof the bearing, andvvresulting in a total absence of slippage or sliding, and the minimumof friction between the parts.

My invention issusceptible of embodiment in diferent forms ciconstruction, a number of which I have represented in the accompanyingdrawing by wayl of examples. llt will be lma-i'iifest, however', tothose skilled in the art, that the details may be variously changed andmodied without deinvention consists inthe combination with inner andcuter casnig'members proparting from the spirit of the invention; andfurther it will be understood that the invention-is not limited to anyparticular former construction of the parts, except in so far as suchlimitations are specilied in the claims.

In the accompanying drawings:

Figure 1 is an axial sectional elevation through an anti'frictionbearing embodying my invention in one form.

Fig. 2 is a side elevation of a portion of the bearing, certain partsbeing omitted to expose other parts to view, andcertain parts beingshown insection.,

Fig. 3 is a longitudinal section through one side of the concentriccasing members, the rolling elements being omitted.

Fig. 1l is an elevation of one or' the rolling elements of the' form ofbea-rin f illustrated in the preceding figures.

Fig. 5 is a longitudinal sectional elevation through one side of abearing oi.i modified form.

Fig. 6 is a Similar modilication.

Referring to the drawings:

Referring particularly to Figs., 1 to d inclusive, my improved bearingcomprises an inner casing member l, an outer casing member Q surroundingthe same concentrically, and a series of interposed rolling elements 3.The inner casing member is provided on its external surface with anoutwardly extending central rib d, the central portion of' which iscylindrical as at 5, whilevthe side portions are convex axially, therebyproducing two circumferentially extending tracking surfaces 6, curvedoutwardly axially between their ends, the curvature being preferablyfrom a, common center 7 located inside the tracking suriaces. Thecutercasing member 2 is likewise provided on its interior with an inwardlyextending rib 8 having its central portion cylindrical as at 9, whileits side portions are convex axially, thereby forming twocircumferentially extending tracking surfaces l0, the curvature of whichare preferably from a common center 1l situsted outside of the saidtracking surfaces. The rolling elements 3 are each in the form view ,ofstill another of an elongated roller, provided with straight bearingsurfaces l2 which slope outwardly from the center of ,the roller,thereby forming abutments at -the Opposite ends 'of-the roller, disposedat opposite angles relatively to the respective tracking surfaces bers.The position of the sloping supporting surfaces on the rolling elementsrelatively to the tracking surfaces on the cas;- ing members is such,that, with the rolling elements assembled between the' casing members,these surfaces will engage with each other, and owing to the curvatureof the tracking surfaces, and the straight form of the engagingsupporting surfaces, the rolling elements will. travel on the trackingsurfaces on single lines of contact, as indica-ted by the dotted lines Xat the upper part of Fig. 1. As a result, the radial loads imposed `onthe bearing will be received conjointly by the two sloping supportingsurfaces of the rolling elements, and the end thrust loads imposed onthe bearing, exerted alternately in opposite directions, will bereceived by the individual supporting surfaces alternately at oppositeends of the rolling elements. The effect of the outwardly slopingsupporting surfaces on the rolling elements,ris to present abutinentsatopposite'ends of the same, which abutments are disposed at oppositeangles respectively to the curved tracking surfaceson the casingmembers, and in the most favorable position to sustain both the radialloads, and the oppositely acting end thrust loads. The parts are soconstructed and relatively disposed, that the lines of travel of therolling elements on the tracking surfaces are equidistaiit from a commonpoint between them, the result being that the parts will act with a truerolling effect, will be free from sliding or slippage, and the operationof the bearing will be attended with the minimum of friction and wear.

The rollingelements maybe assembled between the casing members in anysuitable and appropriate manner; 'for instance such a limited number ofthev rolling elements may be employed as assembled between the casingmembers when the latter are displaced eccentrically, and after thecasing members have been restored to their concentricrelation, therolling out the. annular space between them, and may be maintained inproper spaced relation by means of spacingrings or cages 13 providedatintervals with bearing openings to receive studs or journals 14projecting outwardly from the opposite ends of the rolling-'I elements.The casing members are preferably made as integral rings, and with therolling elements assembled therebetween as shown, 'they will act to holdthe parts of the bearing together after assemblage, thereby forming aunit-handling bearing.

' In Fig. 5 I have shown a modified form of my improved bearing. In thiscase the4 6 and 10 on the two casing mem-.

will enable them to bev elements may be distributed throughsupportingsurfaces 12a on the rolling elements are curved instead of straight, butslope outwardly in opposite directions from the center of the element,as in the first instance described. Tlie tracking surfaces 6a and 10a onthe casing members are straight, instead of curved as irst described.The surfaces engage each other at single lines of contact, and theoperation of the parts, and the consequent advantages enumerated inconnection with the construction of the preceding igures, are the sameAtherefore in this modified form.

In Fig. 6 I have represented still another modification. Here it will beseen that both Athe supporting surfaces 12b on the rollingr andelements, and the tracking surfaces 6b 10b on the casing members, .arecurved, their curvature being from different radii so that they willengage each other, in the operation `of the bearing, on single lines ofcontact as indicated by thel dotted lines X in this figure. i In all ofthe constructions described, the

rolling elements are forined'with ontwarliy sloping supporting surfaces,which supporting surfaces in the construction of Figs. 1

to el are straight, while in Fig. 5 they are of convex form, and in Fig.6 they are of concave form, all however presenting in effect, abutmentsat the enlds of the rollers to receive the radial and end thrustsimposed on the bearing' Also in all of the different forms, the casingmembers are provided on their adjacent sides with inwardly extendingcircumferential ribs, forming two tracking surfaces, convex axially asin Figs. 1 to 4 and in Fig. G, and straight as in Fig. 5. The functionand operation of the parts of the several lifferenty forms, is howeverthe same in the respect that the rolling elements travel on the trackingsurfaces of the casing members on single lines of contact, the singleseries of roll-ing elements receiving both the radial loads, and the endthrust loads I exerted in opposite directions; and the parts of thebearing operating without slippage or sliding and with the minimum offriction 'and wear.

Having thus described my invention, what I claim is:

1. An antifriction bearing comprising innerand outer' casing members anda series of interposed rolling elements, the outer casing member beingprovided with two circumferentially extending tracking surfaces on theinterior of the same, and the said inner casing member being providedwith two cii'cumferentially extending tracking surfaces on the exteriorof the same, and disposed respectively opposite tracking surfaces on theouter member, and the said roll- 'ing elements being provided each withtwo Leccese ed to travel respectively on the opposing tracking surfacesof the casingmembers on single llines of Contact.

2. An antit'rirtion bearingr comprising inner and outer easinzgr membersand a Series of interposed roll-ing elements, the outer casingmemberbeing ro'\'ided with two circumferentially extending,r tracking"rsurfaces projecting inwardly from the interior of the memberand the saidinner casing' member.

being provided with two circumferentially extending tracking surfacesprojecting outwardly from the exterior of the member,v and disposedrespectively opposite the tracking,r

surfaces on theoutermenibei, 'and the seid rolling elements beinzgrprovided each with two supporting surfacessloping from the center oftheelement outwardly in opposite directions and adapted to tra-velrespectively on the opposing trackin surfaces of the casing members onsingle ines of Contact.

3. An'antifriction bearin dcomprising in;` ner and outer casing' inemersfiand a, series of interposed rolling elements, the outer casingmember being provided on 'its interior with tivo circumferentiallyextending tracking sux-feces convex in cross section, and the said innercasing inemberbeing provided on its exterior with two circumferentiallyextending tracking surfaces convex in cross section and disposedrespectively opposite the tracking surfaces of the our member"`v and thesaid rolling elements being prov vided each with two straight supportingsur# faces sloping),l outwardly from the center in ing surfacesprojecting inwardly and curvede' axially from a common center locatedout-4 wardly of said surfaces, and the said lnner cumferentiallyextending trackingsurfnfcee! ,Y projecting' outwardly' from the exteriorolfy 561 the member and curved axially from a. com mon center disposedinwardly of seidrsuv faces, and the said rollingl elements being' le)provided each with two supporting sliraces i sloping; from the centeroutwardly in oppo- 55 l site directions and adapted to travelrespectively on the opposing treclring surfaces of the casing memberslon single lines ofcontact.

In testimony whereof I have e'llxed signature. s REGINALD JACOB KOSTIJR.-J f

